The Primary Issue
Many a potted plant perishes to excessive attention; watering your plants whenever you look proves terminal. This method for watering promises more measured and more deliberate hydration. Yet, is it really function?
This Suggested Method
Set a couple of ice blocks atop the soil. The theory suggests when the ice thaws, it gradually provides water, providing the root system time to drink in it and preventing waterlogged earth.
The Detailed Method
This technique is most effective for little planters and plants that dislike overwatering, such as moth orchids. However, most of tropical-loving houseplants are averse to cold temperatures. A plant's roots evolved for temperate conditions, and freezing water can damage or hurt them. Room climate has a major part in the technique's effectiveness: in a toasty room, the ice will thaw very quickly, providing scant advantage, but in a cool room it may linger excessively, cooling the roots and slowing water uptake. Always ensure ice cubes are frozen from pure, filtered water and never press them right onto the base or delicate roots.
Conducting a Trial
I tested on a Phalaenopsis. Two cubes per week kept the roots evenly damp preventing saturation. However, employing the same method on a Calathea led to brown edges at the foliage margins, a telltale indication of chill damage.
The Final Conclusion
The cube method might be effective for Phalaenopsis, yet it is not appropriate for many warm-climate houseplants and hinges heavily on room conditions. Therefore, this method won't be recommended; room-temperature water given carefully is still the most reliable method to effectively hydrate your leafy friends.